326 BRASSICACEAE 



9. L. papilliferum (Henders.) Nels. & Macbr. Biennial; stem intricately 

 branched, 1-2 dm. high, bushy; leaves pinnatifid, with oblong, acute divisions, 

 2-4 cm. long; raceme short and dense; petals white, twice as long as the sepals; 

 pedicels in fruit spreading or recurved; pod suborbicular, notched at the apex, 

 3 mm. long, slightly papillose; style 0.6 mm. long. L. montanum papilliferum 

 Henders. Sage-brush plains: Ida. Son. My-Je. 



10. L. brachybotryum Rydb. Stem 2-3 dm. high, branched, puberulent 

 throughout; basal leaves puberulent, bipinnatifid, with elliptic or obovate lobes; 

 stem-leaves oblanceolate, pinnatifid or toothed; petals white, clawed, 2 mm. 

 long; fruiting racemes short; pod rounded-ovate, 3 mm. long, wing-margined 

 above. Dry valleys: Utah. Son. Je-Jl. 



11. L. alyssoides A. Gray. Stems usually several, 2-5 dm. high, corym- 

 bosely branched, puberulent above; lower leaves pinnatifid with linear divisions, 

 glabrous; upper leaves entire, narrowly linear; petals distinctly clawed, 2-3 mm. 

 long; pod ovate, rarely oval or elliptic, about 4 mm. long; style about 0.5 mm. 

 long. Plains and river valleys: Tex. Ariz. Utah Colo. Son. Ap-S. 



12. L. Jonesii Rydb. Perennial, with a short woody caudex; stems 2-3 

 dm. high, branched, glabrous; lower leaves pinnatifid with linear acute 

 divisions; upper leaves entire, narrowly linear; racemes rather short and dense; 

 petals white, about 3 mm. long, much exceeding the sepals; stamens 6; pod 

 oval, about 4 mm. long and slightly over 2 mm. wide, glabrous, retuse; style 

 about 1 mm. long. Dry places: Utah Nev. Son. Submont. Ap-Je. 



13. L. Eastwoodiae Wooton. Perennial, with a woody base; stems 5-10 

 dm. high, corymbosely branched above; lower leaves 3-5 cm. long, pinnately 

 divided, with oblong acute divisions; upper cauline leaves oblong-lanceolate to 

 linear, usually entire; racemes short and crowded; petals elliptic, white, 3 mm. 

 long, clawed; pods elliptic-ovate, emarginate. In rocky places: N.M. Utah. 

 Submont. Je. 



14. L. Fremontii S. Wats. Shrubby below, 3-10 dm. high; stem glabrous 

 and shining; lower leaves glabrous, pinnatifid, with linear divisions, the upper 

 entire, linear, more or less fleshy; petals clawed, 3 mm. long; blades rhombic- 

 obovate; pods 5-7 mm. long and fully as broad, orbicular or obcordate, scarcely 

 winged; style 0.5-0.7 mm. long. Rocky and arid ground: Utah Ariz. Calif. 

 L. Son. Ap-Je. 



15. L. idahoense Heller. Stem 2-5 dm. high, sparingly and minutely 

 pubescent, simple below, branched above; basal leaves spatulate, coarsely toothed 

 or pinnatifid; lower stem-leaves oblanceolate, laciniately dentate, the upper 

 linear and entire; petals white, clawed, about 2 mm. long; pod orbicular, about 

 3 mm. long. River banks, canons, and foot-hills : Ida. Colo. Son. Submont. 

 My-Je. 



16. L. virginicum L. Annual or biennial; stem erect, more or less pubes- 

 cent, leafy, corymbosely branched above; basal leaves lyrate-pinnatifid, more or 

 less hirsute; lower stem-leaves oblanceolate, incised, the upper narrower, remotely 

 dentate; petals clawed, about 1.5 mm. long; stamens 2-6; pod suborbicular, 3 

 mm. long, winged above, with rounded lobes. Waste places, fields, and road- 

 sides: Que. 'Fla. Tex. Utah; Mex., W. Ind., C. Am., S. Am.; naturalized 

 in the Old World. Plain Submont. Ja-D. (in the Rockies, My-Au). 



17. L. texanum Buckl. Annual; stems glabrous or nearly so, 3-5 dm. 

 high ; branched above; lower leaves obovate or oblanceolate, somewhat pubes- 

 cent, coarsely toothed; upper stem-leaves linear, mostly entire, glabrous and 

 shining; petals slightly more than 1 mm. long; stamens mostly 2; pod orbicular, 

 3 mm. long, narrowly wing-margined above. L. intermedium A. Gray. L. 

 medium Greene. Sandy soil: Mo. Ala. 'Tex. Calif. B.C.; Mex. Son. 

 Ap-Au. 



18. L. hirsutum Rydb. Annual or biennial; stem strict, 3-5 dm. high; 

 lower leaves lyrately pinnatifid, with broad, toothed lobes, densely hirsute; 

 upper leaves oblanceolate, coarsely and saliently toothed; petals white, 1 mm. 

 long, clawed; stamens usually 2; pod rounded-oval, 3-3.5 mm. long. L. inter- 



